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877b9b2f1a
* 🛡️ feat: Configurable Baseline HTTP Security Headers Adds helmet's CSP-independent headers (HSTS, X-Frame-Options, X-Content-Type-Options, COOP, CORP, Referrer-Policy) on every response, with contentSecurityPolicy explicitly disabled. Every header that can break a deployment is configurable, so there is no allow-list to go stale the way #7377's hardcoded CSP directives did. HSTS includeSubDomains defaults off rather than matching helmet's on-by-default: it would otherwise pin every sibling subdomain to HTTPS for a year in every visitor's browser, and undoing that requires serving max-age=0 from each affected host. * 🛡️ feat: Nonce-Based Content Security Policy for the SPA Shell Adds an opt-in, per-response nonce CSP on the HTML response, resolved once at startup so each request only mints a nonce and concatenates the header. Report-only by default, since that is the rollout step #7377 skipped. Rebase and correctness pass over #13226: - Styles carry no nonce. A nonce in style-src makes browsers ignore 'unsafe-inline', which would have blocked the <style> element the theme script injects at runtime, plus every style third-party components inject. - frame-ancestors 'self' is now a default rather than opt-in, so enabling CSP actually covers the clickjacking half of #7110. - CSP_SCRIPT_SRC_EXTRA now drops 'strict-dynamic', which would otherwise make browsers ignore the very hosts the operator configured. - Nonce stamping runs after the query-devtools bootstrap injection so that injected script is covered too. * fix: replace frame-ancestors instead of merging it Merging the configured value into the default turned a deliberate CSP_FRAME_ANCESTORS='none' into `frame-ancestors 'self' 'none'`, which browsers resolve back to 'self'. Also bail out if the serialized policy somehow lacks the nonce slot rather than emitting a header the shell cannot match. * fix: address Codex review findings on the CSP defaults All five were real against LibreChat's actual runtime: - CSP_REPORT_ONLY now only enforces on an explicit false/off/0/no. A typo or `1` previously fell through isEnabled() to enforcing, turning a config slip into a blocked SPA. Shares the parse helper with headers.ts via a new security/env.ts. - Module preloads are stamped. A production client/dist/index.html carries 32 parser-inserted `<link rel="modulepreload">` tags, which 'strict-dynamic' does not cover and 'self' cannot rescue. - Stale nonce attributes are replaced rather than preserved; only the current response's nonce is authorized. - worker-src allows data:, which Monaco's default CDN loader needs to bootstrap its workers (there is no loader.config() in the client). - script-src allows 'wasm-unsafe-eval' for the HEIC upload path, which compiles WebAssembly through heic-to. Narrower than 'unsafe-eval'. Verified against the real built shell: 4 scripts and all 32 preloads nonced, stylesheets/icons/manifest and <style> untouched. * fix: address second Codex round on CSP rollout controls - SECURITY_HEADERS=false now disables CSP too. It is documented as the global kill switch, and an operator reaching for it to recover a shell broken by an enforcing policy must not be left with that policy on. - The SPA shell is forced to `no-store` while CSP is enabled, ignoring INDEX_CACHE_CONTROL/INDEX_PRAGMA/INDEX_EXPIRES and warning when they are set. A cacheable shell pins one nonce across page loads and users, which is the whole thing a nonce policy defends against. - Added CSP_ALLOW_WASM and CSP_ALLOW_DATA_WORKERS. The previous commit's .env.example claimed CSP_ADDITIONAL_DIRECTIVES could drop 'wasm-unsafe-eval' and data:, but merging only ever appends sources, so the documented hardening step was impossible. These toggles make it real. |
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